Manhole assembly

Abstract

A manhole assembly including a base, riser, and cap. The base having an upper surface forming a bench, a bottom surface, and a radially outward surface with penetrations there through; and a radial spigot in the radially outward upper edge of the base. The base having a corrosive-resistant layer covering the channels, bench, and radial spigot. Also disclosed is a riser comprised of a corrosive-resistant polymer pipe having a radially outward surface, an inner surface and a bottom surface in contact with, supported by, and sealed to the radial spigot. The cap having a radial spigot, and access hole; the radial spigot in the radially outward bottom edge of the cap resting upon and sealed to an upper edge of the riser. The radially outward surface of the cap and base are aligned with the radially outward surface of the riser.

The invention claimed is: 
     
       1. A manhole assembly comprising:
 an annular radial spigot placed at a radially outward facing upper edge of a manhole base; 
 the annular radial spigot having a substantially vertical surface and a cooperating horizontal surface to form the spigot for receiving a manhole riser; 
 the manhole riser comprised of a corrosive-resistant structural polymer pipe having an inner surface sealed to the radial spigot and a bottom surface in contact with, supported by, and sealed to the radial spigot, the manhole riser being a length of straight pipe having a constant outer diameter, the length of straight pipe being without a bell structure on either end; 
 a manhole cap comprising;
 a radial spigot in a radially outward facing bottom edge of the manhole cap; 
 the radial spigot in the radially outward bottom edge of the manhole cap contacting the inner surface of the manhole riser; and 
 the manhole cap resting upon and supported by an upper edge of the manhole riser, the manhole cap having an outer diameter equivalent to and substantially aligned with the outer diameter of the manhole riser. 
 
 
     
     
       2. The manhole assembly as recited in  claim 1  wherein the manhole riser comprises a monolithic polymer. 
     
     
       3. The manhole assembly as recited in  claim 2  wherein the manhole riser comprises polyvinyl chloride. 
     
     
       4. The manhole assembly as recited in  claim 2  wherein the riser consists of polyvinyl chloride. 
     
     
       5. The manhole assembly as recited in  claim 1  further comprising a wrap seal sealed to the radially outer surface of the riser and the manhole base. 
     
     
       6. The manhole assembly as recited in  claim 1  further comprising a wrap seal sealed to the radially outer surface of the riser and the manhole cap. 
     
     
       7. The manhole assembly as recited in  claim 1  wherein the pipe is a monolithic structure of corrosion resistant material. 
     
     
       8. The manhole assembly as recited in  claim 1  wherein the manhole cap having a continuous corrosive-resistant layer covering the bottom surface, radial spigot, and access hole. 
     
     
       9. The manhole assembly as recited in  claim 1  wherein the manhole base comprises a continuous corrosive-resistant layer covering the channels, bench, and radial spigot. 
     
     
       10. The manhole assembly as recited in  claim 1  wherein the radially outward surface of the manhole cap is substantially aligned with the radially outward surface of the manhole riser, and the radially outward surface of the manhole base is aligned with the radially outward surface of the manhole riser. 
     
     
       11. The manhole assembly as recited in  claim 10  further comprising a first wrap seal sealed to the radially outer surface of the riser and the manhole cap; and a second wrap seal sealed to the radially outer surface of the riser and the manhole base. 
     
     
       12. The manhole assembly as recited in  claim 1  wherein the manhole base comprises an aggregate main body having an upper surface forming a radially outward upper edge, and a radially outward surface.